Improved machine for sawing marble



P. .I TORNEY, OF WASHINGTON, DISTRICT OF COLUMBIA Letters Patent No. 84,518, dated December 1, 1868.?

IMPROVED MACHINE-FOR SAWIN G- MARBLE.

The Schedule referred to in these Letters Patent `and making part-of the same.

To all whom it 'may concern:

Be it known that I, P. J. TORNEY, of Washington, in the District of Columbia, have invented certain new and useful Improvements in Machines for Sawing Marble; and d'0 hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying-drawings, and to the letters of .reference marked thereon.

The nature of my invention consists in the construction and general arrangement `of a machine forsawing marble, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my-invention appertains, to make and use the same, I will now proceed tddescribe its construction and operation, referring to the annexed drawings, which form a part of this specification, and in which- Figure l is a side elevation Figure'Z, the same in section and 'Figure 3, shows the running gear.

A represents a frame of suitable dimensions, in the upper part of which two shafts, a o, have their bearings. These shafts are placed across the frame, one near each end, and are at one end, outside of the frame, provided Awith a cog-wheel, B

The cog-wheels B B and shafts a c are turned by screw-threads on a shaft, C, which is placed in suitable beaiings on the outside of the frame A.

The shafts a a are provided with pulleys b b, placed at or nea-r each end of the shafts, and directly over the corner-posts ofthe frame A, which posts are grooved a suitable height with two straight grooves, as shown inofig. 2.'

The pulleys b b are square, having any number of sides desired, an odd number being preferable.

Over the pulleys b 7) are placed endless chains D D, which chains run in the grooves mentioned on the corner-posts of the ame A, and at the lower ends of said groovesl the chains D D are placed around other pulleys d (l, which may be round or square, as may be desired, and attached to the posts ofthe frame.

The chains D D may be tightened around the puleys b and d by the clamp e and screw fi, as shown in The two clamps e e, at each end of the frame, are connected by a rod, f, from which rod two arms, g g, descend, these two arms being hinged or pivoted to a saw frame, E, which frame is thus swung from the endless chains D D, andcan be moved back and forth by apitman connecting it with any engine'desired to be used.

A saw, F, or several of them, may beA arranged in any suitable manner inthe frame E.

It will readily be seen that by turning the shaft C in one direction, the endless chains D D will be turned on their pulleys, thus raising the saw-frame E up, and if the shaft O is turned in the opposite direction, the frame will be lowered.

To accomplish this, the end of the shaft C is provided vvith a pinion, Gr, which gears into another pinion, H, on the end of a small shaft, I, which is placed lin suitable bearings on the end of the frame A.

This shaft I is provided with one stationary pulley, J, and two loosel pulleys, L L, placed, one on each side of the stationary one.

If, now, a straight belt is placed over one of the pulleys L, and a turned belt over theother, both being connected with 'the engine, it will lreadily be seen that it is only necessary to change either one of these'belts to the stationary pulley J, to obtain whic ever motion to the saw-frame E is desired, either up o1 down.

When the machine is in operation, it is always desired to feed the saw or saws gradually downwards. For this purpose theshait I is provided witha cogwheel, M, and at the side thereof', -on-the shaft, is a movable arm, N. This arm is provided witha pivoted dog or pawl, O, which catches into the cogs on the wheel M.

The arm N at its outer end is also provided with a pin, Pffromwhich a pitman connects it with the counter-shaft on the exigirle, in such a manner that for each revolution, the dog O will move down around the Wheel a certain distance, catch on one of the cogs, and turn it around, aty the 'same time turning the shaft C, and consequently lower the saw-frame E.

The object ofusing endless chains for suspending the saw-frame, is to prevent the frame from jumping up when moving back.

In all other machines of this kind, it is impossible to run with very great speed, as the chains suspending the frame are not held at their lower end, and consequently the saw-frame will jump up as it moves backwards.

This is obviated by using the endless chains, as these chains are held firmly below as well as above, by the pulleys, and consequently they cannot give.

A machine of this kind can be run with any speed desired.

Having thus fully described my invention,

What I claim as new, and desire to seem-e by Letters Patent, is-

l. The shafts a a, with cog-wheels B B and pulleys b b, in combination with the endless chains D D and pulleys d d, all constructed and arranged substantially as herein set forth.

2. The arrangement of the shaft I with pulleys J and L L, and pinion H, operating in combination with the pinion G and screw-threads on the shaft O to raise o r lower the saw-frame, substantially as herein set forth.

3. The combination of the shaft `I, cog-wheel M, and arm N, the latter provided with a dog or pawl, O, and connected in a suitable manner with an engine for the purpose of feeding the' saw while the machine is in operation, substantially as herein set forth.

In testimony that I claim' the foregoing, I have hereunto set my hand, this 3d day of October, 1868.

P. J. TORNEY.

Witnesses:

LEOPOLD Evnn'r, A. N, MARR. 

